Moose::Cookbook::Snack::Types man page on Kali

Moose::Cookbook::Snack::Types man page on Kali

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Moose::Cookbook::SnackUserpContributed Perl Moose::Cookbook::Snack::Types(3pm)

NAME
       Moose::Cookbook::Snack::Types - Snippets of code for using Types and
       Type Constraints

VERSION
       version 2.2009

SYNOPSIS
	 package Point;
	 use Moose;

	 has 'x' => ( isa => 'Int', is => 'ro' );
	 has 'y' => ( isa => 'Int', is => 'rw' );

	 package main;
	 use Try::Tiny;

	 my $point = try {
	     Point->new( x => 'fifty', y => 'forty' );
	 }
	 catch {
	     print "Oops: $_";
	 };

	 my $point;
	 my $xval	      = 'forty-two';
	 my $xattribute	      = Point->meta->find_attribute_by_name('x');
	 my $xtype_constraint = $xattribute->type_constraint;

	 if ( $xtype_constraint->check($xval) ) {
	     $point = Point->new( x => $xval, y => 0 );
	 }
	 else {
	     print "Value: $xval is not an " . $xtype_constraint->name . "\n";
	 }

DESCRIPTION
       This is the Point example from
       Moose::Cookbook::Basics::Point_AttributesAndSubclassing with type
       checking added.

       If we try to assign a string value to an attribute that is an "Int",
       Moose will die with an explicit error message. The error will include
       the attribute name, as well as the type constraint name and the value
       which failed the constraint check.

       We use Try::Tiny to catch this error message.

       Later, we get the Moose::Meta::TypeConstraint object from a
       Moose::Meta::Attribute and use the Moose::Meta::TypeConstraint to check
       a value directly.

SEE ALSO
       Moose::Cookbook::Basics::Point_AttributesAndSubclassing
       Moose::Util::TypeConstraints
       Moose::Meta::Attribute

AUTHORS
       ·   Stevan Little <stevan.little@iinteractive.com>

       ·   Dave Rolsky <autarch@urth.org>

       ·   Jesse Luehrs <doy@tozt.net>

       ·   Shawn M Moore <code@sartak.org>

       ·   יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>

       ·   Karen Etheridge <ether@cpan.org>

       ·   Florian Ragwitz <rafl@debian.org>

       ·   Hans Dieter Pearcey <hdp@weftsoar.net>

       ·   Chris Prather <chris@prather.org>

       ·   Matt S Trout <mst@shadowcat.co.uk>

COPYRIGHT AND LICENSE
       This software is copyright (c) 2006 by Infinity Interactive, Inc.

       This is free software; you can redistribute it and/or modify it under
       the same terms as the Perl 5 programming language system itself.

perl v5.26.1			  2017-12-21Moose::Cookbook::Snack::Types(3pm)

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